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Faced with the problems of high power consumption based on cloud platform, IoT smart energy-saving control system, and insecure management of the training room, resulting in poor energy-saving control effects, a smart energy-saving control system based on OneNET cloud platform and IoT MQTT protocol is proposed. Choose HTML5-20 industrial control board, support MQTT protocol, and communicate with single chip microcomputer. MLX90614 infrared temperature sensor is used to detect radiation to achieve high-precision temperature measurement. Design the HC-SR501 human body infrared sensor module to monitor the safe use of equipment in the training room to avoid large power consumption. According to some functional modules of the system software, the classroom equipment is controlled through the mobile device of the mobile phone app, and the operating status of the equipment is monitored at any time. The remote intelligent control is connected to the OneNET platform to realize the functions of institutional administrator management, equipment operation reports and automatic maintenance. It can be seen from the system test results that the minimum power consumption of the system fan is 40W and the minimum power consumption of the lamp is 0.1 degrees, indicating that the power consumption is less; the temperature and humidity of the training room are within the normal supervision range, indicating that the training room is in a safe state. The system design solves the problem of intelligent management in the training room from the perspective of energy saving and safety management, and also provides protection for asset theft prevention.